/**
 * 包含const 和 define
 * 两种定义方法
 */
#include <stdio.h>

#define LENGTH 10
#define WIDTH 5
#define NEWLINE '\n'

int max()
{
    const int LENGTHS = 100;
    const int WIDTHS = 5;
    const char NEWLINES = '\n';
    int area;

    area = LENGTHS * WIDTHS;
    printf("value of area : %d", area);
    printf("%c", NEWLINES);
}

int main()
{

    int area;

    area = LENGTH * WIDTH;
    printf("value of area : %d", area);
    printf("%c", NEWLINE);
    max();
    return 0;
}